[Code of Federal Regulations]

[Title 40, Volume 31]

[Revised as of July 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 40CFR1039.510]



[Page 510]

 

                   TITLE 40--PROTECTION OF ENVIRONMENT

 

         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)

 

PART 1039_CONTROL OF EMISSIONS FROM NEW AND IN-USE NONROAD 

COMPRESSION-IGNITION ENGINES--Table of Contents

 

                        Subpart F_Test Procedures

 

Sec.  1039.510  Which duty cycles do I use for transient testing?



    (a) Measure emissions by testing the engine on a dynamometer with 

one of the following transient duty cycles to determine whether it meets 

the transient emission standards in Sec.  1039.101(a):

    (1) For variable-speed engines, use the transient duty cycle 

described in Appendix VI of this part.

    (2) [Reserved]

    (b) The transient test sequence consists of an initial run through 

the transient duty cycle from a cold start, 20 minutes with no engine 

operation, then a final run through the same transient duty cycle. Start 

sampling emissions immediately after you start the engine. Calculate the 

official transient emission result from the following equation:



Official transient emission result = 0.05 x cold-start emission rate + 

0.95 x hot-start emission rate.





[69 FR 39213, June 29, 2004, as amended at 70 FR 40463, July 13, 2005]